From patchwork Thu Sep 21 08:51:33 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johannes Berg X-Patchwork-Id: 13394096 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 48D7618042; Thu, 21 Sep 2023 17:10:06 +0000 (UTC) Received: from sipsolutions.net (s3.sipsolutions.net [IPv6:2a01:4f8:242:246e::2]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 64E3E6A4F; Thu, 21 Sep 2023 10:09:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sipsolutions.net; s=mail; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Content-Type:Sender :Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-To: Resent-Cc:Resent-Message-ID; bh=+GqK9nIH4JMvkwqjWovkNfDPm8gLz4+0kcQHvxgQK7c=; t=1695316173; x=1696525773; b=hfLzyQE+WLIlacNFWoSUHIDtrcbN7yLr/2lefzwXQS+b9/D vT6FHChv0AaYBFMryeKkr49rZFPJcG1O0qGyCql0ue/gMeJj0PJH+sM4s4PRQPDqeTUoqh1UasO6g EmhU3IgX/YfTrg6tJGPOlPS99UxOV9BQXi7/CUlEa/LRg5/laO6IwWfC/pdu4hLz6kFfhkaMJBdAN 2CDzoRlC3Z1ttsPOXOa0POfXIw12k1CNdOwMgRyPK30ju06siYlpLujGc4lOy3BwYbt+ihuUHWdV0 PoBY84MOxD+5bzRmJa5P6lRUzScr2hSAnOHsPcpfrSARAc0FGwbp1ggC52V1lmdg==; Received: by sipsolutions.net with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.96) (envelope-from ) id 1qjFPn-00D3lb-1V; Thu, 21 Sep 2023 10:52:03 +0200 From: Johannes Berg To: linux-kernel@vger.kernel.org Cc: linux-trace-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, Johannes Berg Subject: [RFC PATCH 3/4] net: drop_monitor: use drop_reason_lookup() Date: Thu, 21 Sep 2023 10:51:33 +0200 Message-ID: <20230921105129.c6e7e803398d.Idc122c3395bea9652f34ccaa678e918bfd4fae75@changeid> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230921085129.261556-5-johannes@sipsolutions.net> References: <20230921085129.261556-5-johannes@sipsolutions.net> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_BLOCKED, SPF_HELO_PASS,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net From: Johannes Berg Now that we have drop_reason_lookup(), we can just use it for drop_monitor as well, rather than exporting the list itself. Signed-off-by: Johannes Berg --- include/net/dropreason.h | 4 ---- net/core/drop_monitor.c | 18 +++--------------- net/core/skbuff.c | 6 +++--- 3 files changed, 6 insertions(+), 22 deletions(-) diff --git a/include/net/dropreason.h b/include/net/dropreason.h index c157070b5303..0e2195ccf2cd 100644 --- a/include/net/dropreason.h +++ b/include/net/dropreason.h @@ -38,10 +38,6 @@ struct drop_reason_list { size_t n_reasons; }; -/* Note: due to dynamic registrations, access must be under RCU */ -extern const struct drop_reason_list __rcu * -drop_reasons_by_subsys[SKB_DROP_REASON_SUBSYS_NUM]; - #ifdef CONFIG_TRACEPOINTS const char *drop_reason_lookup(unsigned long long value); void drop_reason_show(struct seq_file *m); diff --git a/net/core/drop_monitor.c b/net/core/drop_monitor.c index aff31cd944c2..d110a16cde46 100644 --- a/net/core/drop_monitor.c +++ b/net/core/drop_monitor.c @@ -610,9 +610,8 @@ static int net_dm_packet_report_fill(struct sk_buff *msg, struct sk_buff *skb, size_t payload_len) { struct net_dm_skb_cb *cb = NET_DM_SKB_CB(skb); - const struct drop_reason_list *list = NULL; - unsigned int subsys, subsys_reason; char buf[NET_DM_MAX_SYMBOL_LEN]; + const char *reason_str; struct nlattr *attr; void *hdr; int rc; @@ -630,19 +629,8 @@ static int net_dm_packet_report_fill(struct sk_buff *msg, struct sk_buff *skb, goto nla_put_failure; rcu_read_lock(); - subsys = u32_get_bits(cb->reason, SKB_DROP_REASON_SUBSYS_MASK); - if (subsys < SKB_DROP_REASON_SUBSYS_NUM) - list = rcu_dereference(drop_reasons_by_subsys[subsys]); - subsys_reason = cb->reason & ~SKB_DROP_REASON_SUBSYS_MASK; - if (!list || - subsys_reason >= list->n_reasons || - !list->reasons[subsys_reason] || - strlen(list->reasons[subsys_reason]) > NET_DM_MAX_REASON_LEN) { - list = rcu_dereference(drop_reasons_by_subsys[SKB_DROP_REASON_SUBSYS_CORE]); - subsys_reason = SKB_DROP_REASON_NOT_SPECIFIED; - } - if (nla_put_string(msg, NET_DM_ATTR_REASON, - list->reasons[subsys_reason])) { + reason_str = drop_reason_lookup(cb->reason); + if (nla_put_string(msg, NET_DM_ATTR_REASON, reason_str)) { rcu_read_unlock(); goto nla_put_failure; } diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 415329b76921..9efde769949d 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -126,13 +126,11 @@ static const struct drop_reason_list drop_reasons_core = { .n_reasons = ARRAY_SIZE(drop_reasons), }; -const struct drop_reason_list __rcu * +static const struct drop_reason_list __rcu * drop_reasons_by_subsys[SKB_DROP_REASON_SUBSYS_NUM] = { [SKB_DROP_REASON_SUBSYS_CORE] = RCU_INITIALIZER(&drop_reasons_core), }; -EXPORT_SYMBOL(drop_reasons_by_subsys); -#ifdef CONFIG_TRACEPOINTS const char *drop_reason_lookup(unsigned long long value) { unsigned long long subsys_id = value >> SKB_DROP_REASON_SUBSYS_SHIFT; @@ -149,7 +147,9 @@ const char *drop_reason_lookup(unsigned long long value) return NULL; return subsys->reasons[reason]; } +EXPORT_SYMBOL(drop_reason_lookup); +#ifdef CONFIG_TRACEPOINTS void drop_reason_show(struct seq_file *m) { u32 subsys_id;